The sound depends on how many you remove. Just do 1 at a time and reinstall to test. I have mine hollowed out and I can tell you they are slightly louder than Sceptres.My friend runs the Sceptre pipes with no baffles and my shotguns I made from SM tapered pipes are about the same,Wendys slash cut stock America pipes gutted are slightly louder than both of ours.
To give you an idea of the sound if you have ever heard a 60s Triumph with drag pipes, it isn't that loud. (like my chopper)

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